The main site of red blood cell production is the liver.
Answer:
a
Explanation:
A. Channel and carrier proteins move substances in a certain direction, regardless of their concentration gradients.
If another predator, that is more efficient hunter, enters the territory of the puffins, the puffins will find themselves in a very tough situation. They will either have to adapt very quickly, or die out.
The evolutionary pressure will be there fro the puffins to push them in a direction to adapt and be netter hunters, thus fight for their existence. That would mean that the puffin's beak, but also their speed and efficiency will have to improve in order to compete or even out-compete the new predator.
If the puffins do not manage to adapt relatively quickly, and a food shortage occurs, than they will die out, as they will lose the fight for food constantly.
<span>F alling in love with Winter; she’s ice cold dressed in snow white lace
A ll the while dating Summer, who’s still sizzling hot
L ove affairs bruised with revengeful reds, oppressed oranges, and yelling yellows
L eaving Summer with a promise to one day rekindle their love</span>
